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05-12-2002, 05:00 PM #5
Danfoss TEN2-OX - R-134A
I need to look at this in (other) units to see the picture -
.44kW = 1,494BTUh
SCENARIO 1
PD = 130psig
condensing temperature = 118degF
discharge pressure = 181psig
evaporating pressure = 46psig
evaporating temperature (SST)= 41.1degF
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SCENARIO 2
PD = 58psi
condensing temperature = 80degF
discharge pressure = 88psig
evaporating pressure = 25psig
evaporating temperature = 29degF
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the datasheet, which says 0.5 kW capacity at 8 bar difference
at 0C = .47
at -10C = .44
at -20C = .41
at -30C = .37
at -40C = .33
...at 4bar
10C = .43
0C = .42
-10C = .38
-20C = .35
-30C = .32
-40C = .28
at 15K subcooling, a correction factor of 1.2 would be applied.
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I assume design SST should be about -10C to -6C (14 to 20degF), huh? The machine doesn't seem to be able to reach such a condition. I rule out short-charge due to the low pressure ratio at the low-load condition. Running a 90psi head, I would expect to see a lower evaporating pressure/temperature than you have indicated, assuming proper charging and technique.
I'm still leaning towards compressor failure.
I would like to know compressor information.......
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